This is a straightforward transatlantic deal worth bookmarking if you're planning a spring 2026 trip to the UK. United MileagePlus members can fly economy from Chicago O'Hare to London Heathrow for 40,000 miles each way, with minimal taxes and fees of just $6.
For context, economy awards on this route typically price at around 60,000 miles when booked through United. At 40,000 miles, you're getting about a third off the usual cost—a solid value for one of the most popular transatlantic routes from the Midwest.
Availability appears strong for travel on April 21, 2026, with plenty of seats showing at this rate. Late April is a nice window for London travel: milder weather, longer days, and you'll be past the Easter holiday rush.
One practical tip: if you're traveling as a family, search for the full number of passengers you need right away. Award space can vary by seat count, and locking everyone in at this rate makes the savings add up quickly.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search